Added JS code back to handle buttons that are not part of toolbars.
Added JS code back to handle buttons that are not part of toolbars.

Buttons on RHN Updates screen are html biuttons that are not part of center toolbars. Added code back to handle enable/disable state of such buttons. This issues was introduced by changes in https://github.com/ManageIQ/manageiq/pull/4853 commit: c731ca576b93f658c9706114b093f92b447dd9af

https://bugzilla.redhat.com/show_bug.cgi?id=1378165

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